infrastructure The physical hardware used to interconnect computers. Infrastructure also includes
the software used to send, receive, and manage the signals that are transmitted.
initiator A media (host) server that runs the backup/restore application that passes
commands and data between the network and the VLS.
inputs/outputs per
second
A performance measurement for a host-attached storage device or RAID controller.
library A storage device that handles multiple units of media and provides one or more
drives for reading and writing them, such as a physical tape library and virtual
tape library. Software emulation of a physical tape library is called a virtual tape
library.
logical unit
number (LUN)
An address used in the SCSI protocol to access a device within a target. In the
case of the VLS, a LUN is assigned to each virtual library and tape drive.
LUN mapping A mechanism of changing the LUN assignments for a specific host.
LUN masking An authorization process that makes a LUN available to some hosts and
unavailable to other hosts.
mean time until
data loss (MTDL)
The average time until a component failure can be expected to cause data loss.
This includes the consideration that RAID redundancy can protect against data
loss from the failure of a single component.
media access
control (MAC)
address
A low-level unique hardware identifier for every Ethernet port in the world that
is physically stored inside a network card or similar network interface. MAC
addresses are assigned by the IEEE.
media server A computer whose purpose is to move or copy data from one location to another,
such as from network clients to tape cartridges in a library.
node A server that contains the hardware and firmware required to run a virtual library
system. This refers to a hardware assembly containing a power supply, cooling
fans, motherboard, expansion boards, and internal hard drives to support the
VLS system.
oversubscription A condition that exists when more virtual media storage is configured on a VLS
than there is physical storage available.
Because the VLS dynamically allocates storage space as user data is written, the
VLS allows you to allocate more storage for virtual media than is physically
available.
port mapping A mechanism of assigning a LUN (virtual device), such as a virtual library or
tape drive, to a specific FC host port. Port mapping allows you to load-balance
the LUNs among the FC host ports to maximize bandwidth.
At this time, you must manually load-balance the virtual tape drives in a VLS.
primary node A computer (node) that provides primary administrating and control for backup
and restore operations on a server cluster and provides communication and
control for all secondary servers on the system.
RAID A RAID volume consists of more than one drive, but appears to the operating
system to be a single logical disk. RAID improves performance by disk striping,
which involves partitioning each drive's storage space into units. By placing data
HP StorageWorks 12000 Gateway Virtual Library System User Guide 251
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